org.linqs.psl.database.atom

Class AtomManager

java.lang.Object

org.linqs.psl.database.atom.AtomManager

Direct Known Subclasses:

PersistedAtomManager, SimpleAtomManager

public abstract class AtomManager
extends Object

Provides centralization and hooks for managing the GroundAtoms that are instantiated from a Database. By wrapping ReadableDatabase.getAtom(Predicate, Constant...), an AtomManager gives additional control over the GroundAtoms that come from that Database. Additionally, AtomManagers can support other functionality that might require coordination by providing a single component to call to carry out tasks. An AtomManager should be initialized with the Database for which it is managing Atoms.

Field Summary

Fields

Modifier and Type	Field and Description
protected Database	db

Constructor Summary

Constructors

Constructor and Description
AtomManager(Database db)

Method Summary

Modifier and Type	Method and Description
ResultList	executeGroundingQuery(Formula formula) Calls ReadableDatabase.executeGroundingQuery(Formula) on the encapsulated Database.
ResultList	executeQuery(DatabaseQuery query) Calls ReadableDatabase.executeQuery(DatabaseQuery) on the encapsulated Database.
abstract GroundAtom	getAtom(Predicate predicate, Constant... arguments) Returns the GroundAtom for the given Predicate and GroundTerms.
Database	getDatabase()
boolean	isClosed(StandardPredicate predicate) Calls ReadableDatabase.isClosed(StandardPredicate) on the encapsulated Database.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

db

protected final Database db

Constructor Detail

AtomManager

public AtomManager(Database db)

Method Detail

getAtom

public abstract GroundAtom getAtom(Predicate predicate,
                                   Constant... arguments)

Returns the GroundAtom for the given Predicate and GroundTerms. This method must call ReadableDatabase.getAtom(Predicate, Constant...) to actually retrieve the GroundAtom.

Parameters:

predicate - the Predicate of the Atom

arguments - the GroundTerms of the Atom

Returns:

the Atom

executeQuery

public ResultList executeQuery(DatabaseQuery query)

Calls ReadableDatabase.executeQuery(DatabaseQuery) on the encapsulated Database.

Parameters:

query - the query to execute

Returns:

the query results exactly as returned by the Database

executeGroundingQuery

public ResultList executeGroundingQuery(Formula formula)

Calls ReadableDatabase.executeGroundingQuery(Formula) on the encapsulated Database.

isClosed

public boolean isClosed(StandardPredicate predicate)

Calls ReadableDatabase.isClosed(StandardPredicate) on the encapsulated Database.

Parameters:

predicate - the predicate to check

Returns:

TRUE if predicate is closed in the Database

getDatabase

public Database getDatabase()